Mickey is still trademarked, so unless I'm missing something you will not have the rights to do what you want with the 'Mickey' character, however you would have the right copy, translate, recreate in other mediums, the actual work which had fallen out of copyright, like for example 'Steamboat Willie' which Disney has repeatedly prevented from falling into public domain through lobbying for copyright extension.

Of course Disney's intense lobbying in extending the copyright of their works looks even worse when you consider that they've made a vast amount of their fortune by adapting classic public domain works like Snowwhite, Cinderella, Pinocchio, Beauty and the Beast, Alice in Wonderland, Little Mermaid, Aladdin and The Jungle Book, the latter was released one year after Kipling's copyright had expired.